Influence of Biochar Particle Size Fractions on Thermal and Mechanical Properties of Biochar-Amended Soil

被引:21
|
作者
Patwa, Deepak [1 ]
Chandra, Alok [2 ]
Ravi, K. [1 ]
Sreedeep, S. [1 ]
机构
[1] Indian Inst Technol Guwahati, Dept Civil Engn, Gauhati 781039, Assam, India
[2] Univ British Columbia, Sch Engn, Dept Civil Engn, 3333 Univ Way, Kelowna, BC V1V 1V7, Canada
关键词
Biochar; Particle size fractions; Thermal backfill; Compaction characteristics; Thermal and mechanical properties; PHYSICAL-PROPERTIES; WATER-RETENTION; AGGREGATE SIZE; CONDUCTIVITY; AMENDMENT; QUALITY; WASTE; MODEL; CLAY; RESISTIVITY;
D O I
10.1061/(ASCE)MT.1943-5533.0003915
中图分类号
TU [建筑科学];
学科分类号
0813 ;
摘要
Thermal backfill is essential for projects such as underground crude oil pipelines and crude oil storage tanks to control the heat migration from the source. The properties of locally available soil may not be adequate as thermal backfill and hence need suitable amendment. Biochar is a low thermal conductive material and may contribute to an increase in soil strength. There are no such studies that deal with the thermal properties of biochar-based backfill. Further, the influence of biochar particle size fractions on soil thermal properties has not been reported until now. Therefore, the possibility of biochar as a soil amendment for modifying thermal backfill characteristics is explored in this study. Two types of soils (highly plastic silt and clayey sand) are amended with three biochar content amounts (5%, 10%, and 15%), and three different particle size fractions [coarse (4.7-2 mm), medium (2-0.425 mm), and fine (0.425-0.075 mm)], and their compaction characteristics as well as thermal and mechanical properties are investigated. It was observed that the amendment of biochar in soil reduced the thermal and mechanical properties of the soil. Further, the reduction in soil thermal conductivity and volumetric heat capacity with biochar amendment was more in coarser biochar fraction than finer and medium fractions. In comparison, reduction in unconfined compressive strength (UCS) was more in finer biochar fraction. Additionally, the thermal properties reduction was higher in clayey sand than highly plastic silt. An inverse linear correlation of thermal conductivity with pH and electrical conductivity were observed for both soil biochar mixes. The relationship between the thermal properties and UCS indicates that the medium fraction biochar provides the optimized value for reducing thermal properties and UCS of biochar amended soil (BAS). This proves the efficacy of BAS as thermal backfill.
引用
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页数:15
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